{
  "schema_version": "1.4.0",
  "id": "GHSA-wg33-5h85-7q5p",
  "modified": "2025-02-06T19:54:56Z",
  "published": "2025-02-06T17:07:41Z",
  "aliases": [
    "CVE-2025-23217"
  ],
  "summary": "Mitmweb API Authentication Bypass Using Proxy Server",
  "details": "### Impact\nIn mitmweb 11.1.0 and below, a malicious client can use mitmweb's proxy server (bound to `*:8080` by default) to access mitmweb's internal API (bound to `127.0.0.1:8081` by default). In other words, while the client cannot access the API directly (good), they can access the API through the proxy (bad). An attacker may be able to escalate this [SSRF](https://en.wikipedia.org/wiki/Server-side_request_forgery)-style access to remote code execution.\n\nThe mitmproxy and mitmdump tools are unaffected. Only mitmweb is affected. The `block_global` option, which is enabled by default, blocks connections originating from publicly-routable IP addresses in the proxy. The attacker needs to be in the same local network.\n\n### Patches\n\nThe vulnerability has been fixed in mitmproxy 11.1.2 and above.\n\n### Acknowledgements\n\nWe thank Stefan Grönke (@gronke) for reporting this vulnerability as part of a security audit by [Radically Open Security](https://www.radicallyopensecurity.com/). This audit was supported by the [NGI0 Entrust fund](https://nlnet.nl/entrust/) established by [NLnet](https://nlnet.nl/).\n\n### Timeline\n\n- **2025-01-14**: Received initial report. \n- **2025-01-14**: Verified report and confirmed receipt.\n- **2025-01-19**: Shared patch with researcher.\n- **2025-02-04**: Received final confirmation that patch is working.\n- **2025-02-05**: Published patched release and advisory.",
  "severity": [
    {
      "type": "CVSS_V4",
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "mitmproxy"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "11.1.2"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/mitmproxy/mitmproxy/security/advisories/GHSA-wg33-5h85-7q5p"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-23217"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mitmproxy/mitmproxy/commit/fa89055e196d953f11fd241e36ee37858993486a"
    },
    {
      "type": "WEB",
      "url": "https://en.wikipedia.org/wiki/Server-side_request_forgery"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/mitmproxy/mitmproxy"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mitmproxy/mitmproxy/blob/main/CHANGELOG.md"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mitmproxy/mitmproxy/blob/main/CHANGELOG.md#06-february-2025-mitmproxy-1112"
    }
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-288",
      "CWE-441"
    ],
    "severity": "HIGH",
    "github_reviewed": true,
    "github_reviewed_at": "2025-02-06T17:07:41Z",
    "nvd_published_at": "2025-02-06T18:15:32Z"
  }
}